Dear Bhas (and others),
I am with Deepak and Hani - and they have been recently working on Sound in
CLIx. So let us take the Bal Vaigyanik 7 chapter 4 on Sound.
Shouldn't you take the Bal Vaigyanik 8 chapter 4 on Machines?
The other chapters are:
BV7-11-Games with Air
BV7-15-Light (+ page 20 on Playing with Shadows in BV6)
BV8-13-Looking at the Skies
Which ones should we select amongst these? If we look at the tab named
"Marathi Translation"in this document
we see that Light and Magnets are there in both 6th and 7th standard
textbooks of Maharashtra board.
Please let us know about your choice.